Gravity-assisted heat pipe ground cooling source cold storage system and chiller set

Abstract

A gravity-assisted heat pipe ground cooling source cold storage system and a chiller set. The cold storage system includes a gravity-assisted heat pipe, a cold storage pool, a heat exchanging and cold condensing device, and a heat exchanger pipe. An inlet and outlet of the cold storage pool are parallel-connected to cold water pipes of a chiller set, and are connected or disconnected via control valves. The heat exchanger pipe is buried underground, and includes a flow inlet pipe and a flow return pipe having a cross section including a first arc, a second arc, a third arc, and a fourth arc. The second arc and the fourth arc are S-shaped arcs. The first arc has a radius exceeding that of the third arc, and centers of circles of the first arc and third arc are located at the cross section of the flow return pipe.

The invention claimed is: 
     
       1. A cold storage system, comprising:
 a chiller set, wherein the chiller set is provided with cold water pipes; 
 a gravity-assisted heat pipe, a cold storage pool, a heat exchanging and cold condensing device and a heat exchanger pipe; 
 wherein an inlet and an outlet of the cold storage pool are parallelly connected to the cold water pipes of the chiller set, and are connected or disconnected via control valves; the gravity-assisted heat pipe is a separating heat pipe, an evaporating segment of the gravity-assisted heat pipe is arranged in the cold storage pool and a condensing segment is arranged in the heat exchanging and cold condensing device; the heat exchanger pipe is buried underground, and comprises a flow inlet pipe and a flow return pipe, an upper end of the flow inlet pipe and an upper end of the flow return pipe are connected with an inlet and an outlet of the heat exchanging and cold condensing device via heat insulating pipes to form a circulation; an outer wall of the flow inlet pipe is connected with an outer wall of the flow return pipe, the flow inlet pipe is mutually parallel with the flow return pipe, the flow inlet pipe comprises four pipes having circular cross sections, and a cross section of the flow return pipe is formed by a first arc, a second arc, a third arc and a fourth arc connected sequentially to one another, wherein, the second arc and the fourth arc are S-shaped arcs, the first arc has a radius larger than that of the third arc, centers of circles of the first arc and the third arc are located at a cross section of the flow return pipe, and the flow inlet pipe is arranged around the third arc. 
 
     
     
       2. The cold storage system according to  claim 1 , wherein cross section areas of the flow inlet pipe are all the same. 
     
     
       3. The cold storage system according to  claim 1 , wherein sum of the cross section areas of the flow inlet pipe is greater than a cross section area of the flow return pipe. 
     
     
       4. The cold storage system according to  claim 1 , wherein an entire outer diameter of the heat exchanger pipe is 80±0.5 mm, and a wall thicknesses of the flow inlet pipe and the flow return pipe are 3±0.5 mm. 
     
     
       5. The cold storage system according to  claim 1 , wherein an inner wall of the flow return pipe at an end close to the ground is heat-insulated or provided with a heat insulating pipe sleeve inside. 
     
     
       6. The cold storage system according to  claim 1 , wherein a cross section area of the flow return pipe is 50-60% of the sum of the cross section areas of the flow inlet pipe. 
     
     
       7. The cold storage system according to  claim 1 , wherein a cold storage medium is stored in the cold storage pool, the cold storage medium is water, an ethanediol aqueous solution, a 30%˜45% calcium chloride aqueous solution, or an aqueous solution containing 20%˜40% decahydrate sodium sulfate and 15%˜25% trihydrate sodium acetate, or an aqueous solution containing 20%˜40% decahydrate sodium sulfate and 15%˜30% calcium chloride solution. 
     
     
       8. The cold storage system according to  claim 1 , wherein the heat exchanging and cold condensing device is a water cooling device, an air cooling device or a spraying evaporation heat exchanging and cold condensing device. 
     
     
       9. A chiller set for a cold storage system,
 wherein the cold storage system comprises a gravity-assisted heat pipe, a cold storage pool, a heat exchanging and cold condensing device and a heat exchanger pipe; 
 wherein an inlet and an outlet of the cold storage pool are parallelly connected to the cold water pipes of the chiller set, and are connected or disconnected via control valves; the gravity-assisted heat pipe is a separating heat pipe, an evaporating segment of the gravity-assisted heat pip is arranged in the cold storage pool and a condensing segment is arranged in the heat exchanging and cold condensing device; the heat exchanger pipe is buried underground, and comprises a flow inlet pipe and a flow return pipe, an upper end of the flow inlet pipe and an upper end of the flow return pipe are connected with an inlet and an outlet of the heat exchanging and cold condensing device via heat insulating pipes to form a circulation; an outer wall of the flow inlet pipe is connected with an outer wall of the flow return pipe, the flow inlet pipe is mutually parallel with the flow return pipe, the flow inlet pipe comprises four pipes having circular cross sections, and a cross section of the flow return pipe is formed by a first arc, a second arc, a third arc and a fourth arc connected sequentially to one another, wherein, the second arc and the fourth arc are S-shaped arcs, the first arc has a radius larger than that of the third arc, centers of circles of the first arc and the third arc are located at a cross section of the flow return pipe, and the flow inlet pipe is arranged around the third arc; and 
 the cold storage pool is parallel-connected to the chiller set. 
 
     
     
       10. The chiller set for a cold storage system according to  claim 9 , wherein the cold storage pool is connected with the chiller set via a three-way valve.